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new helper: __alloc_fd()

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Essentially, alloc_fd() in a files_struct we own a reference to.
Most of the time wanting to use it is a sign of lousy API
design (such as android/binder).  It's *not* a general-purpose
interface; better that than open-coding its guts, but again,
playing with other process' descriptor table is a sign of bad
design.

Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Al Viro 2012-08-12 17:27:30 -04:00
commit dcfadfa4ec
3 changed files with 16 additions and 58 deletions
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12
fs/file.c
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@ -420,11 +420,10 @@ struct files_struct init_files = {
/*
* allocate a file descriptor, mark it busy.
*/
int alloc_fd(unsigned start, unsigned flags)
int __alloc_fd(struct files_struct *files,
unsigned start, unsigned end, unsigned flags)
{
struct files_struct *files = current->files;
unsigned int fd;
unsigned end = rlimit(RLIMIT_NOFILE);
int error;
struct fdtable *fdt;
@ -479,8 +478,13 @@ out:
return error;
}
int alloc_fd(unsigned start, unsigned flags)
{
return __alloc_fd(current->files, start, rlimit(RLIMIT_NOFILE), flags);
}
int get_unused_fd_flags(unsigned flags)
{
return alloc_fd(0, flags);
return __alloc_fd(current->files, 0, rlimit(RLIMIT_NOFILE), flags);
}
EXPORT_SYMBOL(get_unused_fd_flags);